I wonder what church does that.......lotta gluten free folks are gonna have to tough it out in hell.
Unintentional and the Ignorant pretty much get a free pass.
It could be a grave/mortal sin "missing the mark" if you put something ahead of God, break sabbath.
The legalistic details of losing salvation is up to God.
Imagine someone brought up Catholic, they are catholic for life in church eyes, they split to be a Baptist or whatever, obviously overtly not getting communion. Grave Sin "objectively", I don't think that's going to stick. He might be following his good conscience which is very integral part of Catholicism.
The church is pretty merciful and tries to look at these things in a more positive reinforcement.
It might even be possible to accuse that attending a holy day of obligation out of obligation is a sin, lol.
I'm sure there's lot of coverage of "invincible ignorance" on the matter. Its probably more "graver" sin the more faithful and understanding someone is.
For example I doubt most catholic believe in real presence of the eucharist, if not struggle with it. Toughest teaching, "surpassing understanding". Some folks say only 25% believe which is surprising to me I would have expected 1 out 10 or less.
So imagine this is the belief you hold, The Whole Christ present, body, blood, soul, divinity. As good as, just literally Jesus in person. Once a week? they might have to beat you away from coming more than once a day. (church has limit of twice a day) So for you it might really be a mortal sin.
Sincere heart is very important
Hebrews 10
19Therefore, brothers and sisters, since we have confidence to enter the Most Holy Place by the blood of Jesus,
20by a new and living way opened for us through the curtain, that is, his body,
21and since we have a great priest over the house of God,
22let us draw near to God with a sincere heart and with the full assurance that faith brings, having our hearts sprinkled to cleanse us from a guilty conscience and having our bodies washed with pure water.
23Let us hold unswervingly to the hope we profess, for he who promised is faithful.
24And let us consider how we may spur one another on toward love and good deeds,
25not giving up meeting together, as some are in the habit of doing, but encouraging one another—and all the more as you see the Day approaching.